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Genetics Test Review
Term | Definition |
---|---|
chromosomes | thread-like structures inside the nucleus of each cell that contain genetic material |
gene | a section on a chromosome that has genetic information for one trait two of these are contained in each chromosome pair |
allele | different forms or varieties of a gene |
trait | a genetic factor of a living thing examples of this include eye color, seed shape, attached or unattached ear lobes, curly hair, seed shape, flower color |
phenotype | how a trait is expressed or appears |
genotype | the 2 alleles that control the phenotype of a trait |
dominant | upper case letters represent this type of trait |
recessive | lower case letters represent this type of trait |
homozygous | when two alleles of a gene are the same |
heterozygous | when two alleles of a gene are different |